Low and behold, two weeks after having my TT setup, I threw the P0300 (random misfire) code today while driving like Miss Daisy. When I owned a 3G Eclipse, we ran across that code with the UR crank pulley on the NA setup. UR couldn't alleviate the problem, so they stopped selling the pulleys for the 3G.

1) Should I reinstall the stock pulley on my setup?
2) A New ECU was installed with the TT (long story--it wasn't needed though), but never got calibrated by the Consult II. The keys were just initialized . . . should I have it done?
3) Any other advice?

The car appears to be running fine (normal temps, pressures, etc) and I didn't notice any trouble when the light kicked on . . .

 

So the CEL comes on sometimes but you cant actually feel the car misfire? I personally dont think its the pulleys.

 

Is anyone currently TT'd with a UR pulley too?

 

It's not the pulley. I occasionally get that misfire code too....especially if running too rich, and I floor the car a lot at slightly lower RPM's. As a precaution, did you chance your plugs to two steps colder? I would double check your plugs and make sure they look fine.

Are you retarding timing?

 

I only went one step colder on the plugs and I'm waiting for Greddy's timing fix . . .

 

Ya know... My Z does this strange thing at idle. It idles at about 650 rpm, but once it's warmed up I can hear the motor missfireing or something. The rpm's drop to about 500 and then the motor catches itself. I thought it was something to do with the E-Manage modifying the MAF signal, my conversion is like .55 or something. That couuld cause the ecu to advance the timing a lot because it thinks the motor is only getting half as much air and fuel! I really wish I could get the technosquare software flash, but I simply cannot afford it.

 

etx, do you have an A/F guage? If so, does A/F drop with RPMs?Are you getting the multiple cylinder misfire code as well?

--Steve

 

Mine does the same thing (mods in sig - no fi yet). I assumed I have a leak around my intake plenum somewhere. I have been to lazy to work on it cause i was gonna fix it when the aps tall boy is released and i get one of those.

I could be wrong but that was what i thought was going on. Any input??

 

ya right i had a same problem
but in idle only (idel at few minute) engine service rignt on
and i had a check with OBD the code was miss fire
if over 1200rpm never had a problem
what you guys think ?????

 

i have about 33k miles on my car. i may need plugs. I would like to know whats going on cause it is kinda embarrasing to be sitting at a light with a fine lady and the car jolts slightly from the enging doing whatever it is doing.

 

Interesting News:

I just replaced my UR pulley with my stock one and it doesn't idle as bad. It stays at about 720 with no significant drops and most importantly, no SES light. I guess I'll put some more miles on it and see if I get another light. After going FI, I wanted to eliminate any potential problems and to me, 3-5whp won't be missed too much

G

 

my sputtering did not start till way way after i put my ur pulley on.
i can see the factory one idling smoother but i dont think it is the root problem.

 

You can get misfires and problems if your injectors aren't sealed up tight. The vac at idle will pull air past some of them and cause them to misfire, etc. It's tough to hear it on the VQ35 due to the injectors being somewhat hidden but I recommend to listen for that or take a peek at it.

Mark
www.Quantum-Racing.com

 

what would cause the injectors to have a loose seal?

 

If they got pinched on installation. Usually I use some clean motor oil on the o-rings to make sure they don't bind up. I think I will pull the upper and lower plenums this weekend and replace all the gaskets. Sorry for derailing the thread, but I'm glad to hear some other people are having this same issue. Let's try to get it resolved.

Edit, I do have a wideband. And at idle it sits right at 14.7. When the hicup occurs it will show a little lean on the wbO2, but nothing major.

 

sorry, i did not phrase my q right.

I have this problem with the sputtering but i dont have fi so noone has been in the neighborhood of working on my injectors. If there is a bad seal it would have been caused by something else, or the problem is not related to seals.

thanks,

jon

 

Ah ha! Well if your having the same issue that helps me track it down. I see you have the Kinetix upper plenum, perhaps that's (or the upper intake gasket) is the issue. I reused all my gaskets durring the turbo install, so I think that may be my issue as well. I just went to the Dealer and ordered the lower intake, upper intake and throttle body gaskets. Only $9!! They will be in next week so next weekend I'll replace them. Also, I'll try spraying them with Mopar Gasket sealer as well. That stuff rocks.

 

I would suspect my upper plenum gasket. I have had the part for months but i want to do the fix after i get the aps tallboy plenum. the reason i think it is upper plenum related is that my car exhibited similar behavior when my kinitex v2 cracked. hope that helps. let me know if the gasket fixes yer problem cause that will be quite reassuring for me. My other thoery was a problem with the maf. I have a k&n. Thought some filter oil might have contaminated the maf.

 

Yeah, I'll let you know. It won't be until next weekend.

 

etx,

you ever do that gasket install. I have not had any problems since the weather has cooled down.